head to head · open source
haystack vs LLMTornado
haystack has 26,924 GitHub stars, 3,388 forks, 143 open issues and last shipped yesterday. LLMTornado has 650 stars, 122 forks, 14 open issues and last shipped yesterday. haystack leads on adoption by 4,042% (26,924 vs 650 stars). haystack is written in Python under Apache-2.0; LLMTornado is written in C# under MIT. haystack has attracted 13% as many forks as stars, LLMTornado 19%. LLMTornado was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 5 topic tags (agent-framework, agentic-ai, agentic-rag, agents), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| haystack | LLMTornado | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 650 |
| License | Apache-2.0 | MIT |
| Written in | Python | C# |
| Last push | 2026-11-04 | 2026-11-04 |
| Forks | ⑂ 3.4K | ⑂ 122 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick haystack if
- You weight community size — 27K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick LLMTornado if
- You want the LLMTornado feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and LLMTornado fits your workflow better
About haystack
🎉🎊✨ Haystack 3.0 is out! ✨🎊🎉 Read the announcement here! 🥳 🎈 🎆 🪅 🎇 🍾 🥂 🎁 🌈 Haystack is an open source AI orchestration framework for building production ready LLM applications in Python. Design modular pipelines and agent workflows with explicit control over retrieval, routing, memory, and generation. Build scalable RAG systems, multimodal applications, semantic search, question answering, and autonomous agents, all in a transparent architecture that lets you experiment, customize deeply, and deploy with confidence. Table of Contents Installation Documentation Features Haystack Enterprise: Support &…
read the full haystack overview →
About LLMTornado
LLM Tornado Build AI agents and workflows in minutes with one toolkit and built in connectors to 30+ API Providers & Vector Databases. Official Website LLM Tornado is a .NET provider agnostic SDK that empowers developers to build, orchestrate, and deploy AI agents and workflows. Whether you're building a simple chatbot or an autonomous coding agent, LLM Tornado provides the tools you need with unparalleled integration into the AI ecosystem. ✨ Features Use Any Provider : Built in connectors to: Alibaba, Anthropic, Azure, Blablador, Cohere, DeepInfra, DeepSeek, Google, Groq, LiteLLM, MiniMax, Mistral, MoonshotAI…
read the full LLMTornado overview →
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Frequently asked questions
Is haystack or LLMTornado more popular?
haystack has 26,924 GitHub stars and LLMTornado has 650. haystack has the larger community by that measure.
Are haystack and LLMTornado free?
Both are open source. haystack is licensed under Apache-2.0 and LLMTornado under MIT. Neither carries a licence fee.
What is the difference between haystack and LLMTornado?
haystack is written in Python and LLMTornado in C#. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, haystack or LLMTornado?
Choose haystack if you want the larger community (26,924 stars) or its Apache-2.0 licence terms. Choose LLMTornado if its feature set, stack or MIT licence fits better. Both are self-hostable.